Topic: 750k3 electrical issues - Main fuse blowing- ALL GOOD NOW!!

[Court750Cafe]

Hey guys,

I finished hooking up my DCC gauges with idiot lights built into them last week. I added the 2 into 1 diode to the turn signals and they work as they should. I am running a hondaman ignition.

What is not working on the gauge cluster i noticed was the oil light. Doesn't light up when ignition is on, before i start the bike. Might need to order a new sensor? I noticed i originally hooked the red wire & red/black wire up backwards. So now the red wire is hooked into the blue/red OEM wire to oil sensor, and red/black wire is hooked up to green OEM ground. Still doesn't light up.

My other issue is i was getting ready to start the bike up for the season since i just swapped a new exhaust in. when i just turn the ignition on, everything looked good on the gauge cluster (besides oil light not lighting up). Once i tried to start the bike, it tried turning over for a couple seconds(realized i didn't have choke on), so put choke on and then i blew the main fuse when the bike was just about to start up. I then put another fuse in and just turned the ignition on, and blew a fuse again.

I then checked voltage of my battery(just finished charging on tender a day before) and 15a slot in blade style fuse block, with ignition in on position. reading was 12.52. I then took an OEM front turn signal, hooked up to 15a fuse spot so it was lighting up dim once ignition was on. I then pressed starter button and it would light up brighter. Also the same outcome if I turned the headlight/running lights on, and if i pressed the horn button. don't know if this means anything?

Regardless, put a new fuse back in the next day, and i turned the headlight switch off, then turned the ignition on. Just the neutral switch was lighting up on the gauge cluster as it should've, no blown fuse yet. Pressed the starter button and it seemed to work as it should. This was with the tank off now and no fuel in carbs to start the bike. But no blown fuse when i pressed the starter.

I turned the headlight switch back on and the headlight and running lights worked again as normal, very strange since i thought it was going to blow the fuse. put the tank on, tried to start the bike, and once again when the bike was about to start, i blew a fuse again. Seems like when the bike gets more of a charge when started it blows a fuse. You guys have an idea what that might be? I'm in no way an electrical guru I'm just doing my best to track this down.

Thanks for your time and sorry if I wasn't more specific or technical!

[PeWe]

Maybe a 12V wire close to ground somewhere. Vibrations, movement will cause a short circuit. Or any wires from handle bar switches. Check inside switches, open them up...

Brake lamp get power from 15A fuse. The power is routed via front brake switch on the fork and break switch with spring to brake pedal, Check so none of the connections are close to frame or maybe a short to frame. If you press either brake 15A fuse will blow.

Connection inside Lamp housing, alternator wire connections inside the left gear mechanism cover/front sprocket cover. Any connection touch the engine?

[Court750Cafe]

Maybe a 12V wire close to ground somewhere. Vibrations, movement will cause a short circuit. Or any wires from handle bar switches. Check inside switches, open them up...

Brake lamp get power from 15A fuse. The power is routed via front brake switch on the fork and break switch with spring to brake pedal, Check so none of the connections are close to frame or maybe a short to frame. If you press either brake 15A fuse will blow.

Connection inside Lamp housing, alternator wire connections inside the left gear mechanism cover/front sprocket cover. Any connection touch the engine?

Thanks Pewe I'll check that out ASAP. Just strange that last season all was well and when I start it up this season, I am having this issue. Can someone tell me symptoms of a bad rectifier/regulator etc? Does this sound like that at all either?

[Court750Cafe]

Does anyone know why my oil light in my DCC isn't lighting up either with the ignition on? I thought if the oil pressure switch was going bad the oil light would stay on.

[Court750Cafe]

Does anyone know why my oil light in my DCC isn't lighting up either with the ignition on? I thought if the oil pressure switch was going bad the oil light would stay on.

The Oil switch sends a ground to the gauge. Perhaps you should swap it over?

The oil switch is attached to the blue/red OEM wire going into the headlight housing correct? Sorry calj but what do you mean by "swapping it over"? Thanks again for a response.

[Court750Cafe]

You indicate from the DCC gauge, the red/black is the gauge ground signal for the OIL light. Attach the stock blue/red wire to it, and stock BR/WHT to red. The stock blue/red is a "ground" signal, and may be contributing to you blowing fuses (the moment you begin to turn the electric starter, you are shorting the power back the case, possibly) This also could explain why you have no OIL light in the gauge cluster.

Ohhh gotcha calj appreciate the response. After work I'll have a look at it and swap them out.

[Court750Cafe]

All good now guys. Much appreciative of the help!

1. Oil light - I just did an oil change beforehand, once I was able to start the bike the oil light went on for a second then shut off. I don't know why it didn't go on from the start but the blue/red wire wasn't getting activated until oil circulation. Now when ignition is on, works like a charm, then shuts off at startup confirming oil flow. Thanks Calj, Pewe, and jorwesflow for wiring help

[Court750Cafe]

All good now guys. Much appreciative of the help!

1. Oil light - I just did an oil change beforehand, once I was able to start the bike the oil light went on for a second then shut off. I don't know why it didn't go on from the start but the blue/red wire wasn't getting activated until oil circulation. Now when ignition is on, works like a charm, then shuts off at startup confirming oil flow. Thanks Calj, Pewe, and jorwesflow for wiring help

2. Blowing main fuse - so I realized I was an idiot and with my aftermarket signals, they didn't come with wiring diagrams, so I swapped ground with the running light wire by accident. That's why every time I turned the running lights on, main fuse blew. Thanks to Jorwesflow for that catch! All good now took her out for a quick ride around the block. All is well